/*
   Created by ArduinoGetStarted.com

   This example code is in the public domain

   Tutorial page: https://arduinogetstarted.com/tutorials/arduino-button-long-press-short-press
*/

// constants won't change. They're used here to set pin numbers:
const int BUTTON_PIN = 7; // the number of the pushbutton pin
const int LONG_PRESS_TIME  = 1000; // 1000 milliseconds

// Variables will change:
int lastState = LOW;  // the previous state from the input pin
int currentState;     // the current reading from the input pin
unsigned long pressedTime  = 0;
unsigned long releasedTime = 0;


void setup() {
  Serial.begin(9600);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  // read the state of the switch/button:
  currentState = digitalRead(BUTTON_PIN);

  if (lastState == HIGH && currentState == LOW)       // button is pressed
    pressedTime = millis();
  else if (lastState == LOW && currentState == HIGH) { // button is released
    releasedTime = millis();

    long pressDuration = releasedTime - pressedTime;

    if ( pressDuration > LONG_PRESS_TIME )
      Serial.println("A long press is detected");
  }

  // save the the last state
  lastState = currentState;
}